Tempstorage

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- Nothing changed yet.

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- Add support for Python 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Update package configuration

- Package is now officially undeprecated because the data corruption issue -
that was the reason for its deprecation - has been understood and fixed. See
(`16 <https://github.com/zopefoundation/tempstorage/issues/16>`_).

- Add support for Python 3.8 and Python 3.9.

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- Package is now officially deprecated as it was broken for many years. This
was/ is common knowledge in the zope community, but was not documented
anywhere and thus this package was still used by many community members
without knowing this. See
(`8 <https://github.com/zopefoundation/tempstorage/issues/8>`_)
(`12 <https://github.com/zopefoundation/tempstorage/issues/12>`_)

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- Update PyPy version.

- Drop Python 3.4 support.

- Add support for Python 3.7.

- Avoid RuntimeError in _takeOutGarbage. See `issue 7
<https://github.com/zopefoundation/tempstorage/issues/7>`_.

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- Raise POSKeyError instead of KeyError in loadBefore.